Answer:
because you are using them and it because it your bones get tired
Cardiorepiratory insdurance is an aerobic fitness involving performing exercise at moderate level of intensity for an extended period.
<span>Group practices are groups of healthcare professionals who own and manage a business together. While entering into a group practice removes much of the physician's autonomy, the choice tends to put professionals in a better financial position than if they started a business by themselves. Group practices carry various other benefits..</span>